| 摘要 |
PURPOSE:To control ignition timing properly for the total load range from non- turbo time to on-turbo time by controlling the ignition timing in the on-turbo time in the direction of angle of delay just to meet the reduction of the cycle for the firing delay at the time of turbo-charging. CONSTITUTION:Controls of ignition timing are performed as a normal engine (without turbo-supercharger) through a distributor 18 by working air inlet negative pressure through passages 35, 37 to an operating mechanism 25 in the condition of non-turbo for a turbo-supercharger 4 with less exhaust gas rate in the zone where opening degree of a primary throttle valve 16 is smaller. Then, in interlocking with opening the throttle valve 16, a secondary throttle valve 17, with increase of exhaust gas rate, when it grows to the on-turbo condition, in interlocking with opening the throttle valve 17, a change-over valve 39 is changed over for conducting passages 36, 37. Thus, supercharged pressure is worked on the operating mechanism 25, to control the ignition timing in the direction of delay. |
